Astronomy part 1
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Lines of a particular element appear at the same wavelength in both emission and absorption line spectra.
Consider the spectra of the four objects shown beneath the laboratory spectrum. Based on these spectra, what can you conclude about Object 3?
It is moving toward us
Suppose that Star X and Star Y both have redshifts, but Star X has a larger redshift than Star Y. What can you conclude?
Star X is moving away from us faster than Star Y
Consider an atom of carbon in which the nucleus contains 6 protons and 7 neutrons. What is its atomic number and atomic mass number?
- - Atomic number = 6
- - atomic mass number = 13
If you heat a gas so that collisions are continually bumping electrons to higher energy levels, when the electrons fall back to lower energy levels the gas produces
an emission line spectrum.
From laboratory measurements, we know that a particular spectral line formed by hydrogen appears at a wavelength of 121.6 nanometers (nm). The spectrum of a particular star shows the same hydrogen line appearing at a wavelength of 121.8 nm. What can we conclude?
The star is moving away from us
What is the purpose of adaptive optics?
It reduces blurring caused by atmospheric turbulence for telescopes on the ground.
The stars in our sky twinkle in brightness and color because of
turbulence in the Earth's atmosphere
The spectra of most galaxies show redshifts. This means that their spectral lines ________.
have wavelengths that are longer than normal
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